Compare
E2B Alternative: Sandbox Coding Agents on Your Own Mac
E2B is agent infrastructure: an API and SDKs that start isolated Linux VMs in the cloud for code an agent generates.
Updated
E2B is cloud sandbox infrastructure for products that run other people's generated code. If you just want your own coding agents boxed in while they work on your projects, Forkbench does that on your machine for free: a kernel folder lock, keys agents never read, and a live view of every agent.
E2B is built for platform teams. Forkbench is built for the developer at the keyboard.
| Forkbench | E2B | |
|---|---|---|
| Agents locked to your project folders | Yes. The macOS kernel seals off the rest of your home folder, per Thread | A full cloud VM per sandbox |
| API keys the agent never sees | Yes. The Vault runs the command and the agent only gets the result | Whatever you put in the sandbox |
| Every agent at a glance | Yes. A live pulse on every tab and the task each agent claimed | Build it yourself |
| Know when an agent is stuck | Instantly. It turns red and the Thread counts who needs you | Build it yourself |
| Share one job with a teammate or client | Yes. Invite them to one Thread, never your machine | Build it yourself |
| Human sign-off before work counts as done | Always. Agents report, only you accept | Build it yourself |
| Works with | Any CLI agent: Claude Code, Codex, Cursor CLI, Gemini CLI, Aider, your own scripts | Any, via SDK |
| Price | Free | Hobby free; Pro $150/mo plus usage |
Why developers pick Forkbench
- Nothing to integrate: open a Thread and lock it.
- Your code never leaves your machine.
- Supervision, sign-off and sharing that infrastructure APIs do not provide.
What E2B does well
- A full VM per sandbox, the stronger boundary for untrusted code.
- Open source and built to scale.
The verdict
E2B is the right call if what you are shipping is a product that runs other people's code or other people's agents; a cloud VM per sandbox is built for exactly that, and plenty of teams run it in production while using Forkbench for their own day-to-day agent work. For running your own coding agents on your own machine, Forkbench's folder lock gives you a file boundary for free, with nothing to integrate.
Keep reading
Sources
Comparison based on publicly available information, checked on the date above. Spot something out of date? Tell us.